Telephone-receiver.



J. H'ALLDOW. TELEPHONE RECEIVER.

APPLICATION FILED 001'. a, 1908.

1,033,098. Patented July 23,1912.

UNITED STATEQEATENT OFFICE.

OHN HALLDOW,' OF ELYRIA, OHIO, ASSIGNOR TO THE DEAN ELECTRIC COMPANY, OFELYRIA, OHIO, A CORPORATION OF OHIO.

TELEPHONE-RECEIVER.

If! '0 alt-whom it may conrcrn. @Be it known ,that I, JouN I-Iannnow, a,citizen of. the United States, residing at dllyria, in the county ofLorain and State of Ohio, have invented a certain new anduseful,Improvement in Telephone-Iteceivcrs, of which thefollowing' is afull, clear, concise, ,and exact description, reference being had Ytothe accompanying drawings, forming a 1(1 ia,rt of this specification.

i\'ly' inventionrelates to telephone receivfersand has for itsobject theconstruction of a "receiver shell of metal which shall accomplish all ofthe purposes heretofore secured 15,,in C()l lllt't3ll( )ll with shellsfor such instru- "jments and liaving the additional advantage ofliglitness, durability, improved appearanee and cheapness.

. -lg' ceiver shells havecommonly been made [heretofore of insulatingmaterial of one I. form or another which, generally speaking,

is very brittle in nature and therefore easily broken. Toavoid this.ditliculty the shells have usually been constructed of consider ablethickness, with the resultthat they are 'both clumsy and heavy. By myinvention Ll construct these shells of thin sheet metal 'iind use inconjunctiontherewith a separate threaded ring adapted to cooperate withthe body portion of the shell to secure thereto therecei'ver cap. Thisreceiver cap may be constructed in one pieeeor it may be constructed ina manner similar to the body portion of the shell. 'That is, it mayconsist m a main portion formed of thin sheet metal cooperating withwhich is a separate threaded ring to secure the cap to the bodyportion'of the receiver. 1f preferred, a cap ot insulating material maybe used in connection with the metal shell instead of the metallic capjust referred to.

In constructing my improved receiver shellI make use preferably offorming dies to form sheet metal into the desired conformation. In orderto be readily manipu lated so as to assume the form required, the sheetmetal used must be preferably relatively thin. 'lhis thin material,however, is i 4 not adapted to be. threaded, since the threads would beso tine necessarily as to be of no 1m. 'I urthermore, the threadedportion would'not possess sutlicient rigidity to readil y engagethe-cooperating threaded member.

I eliminate this ditiiculty by using'in conjunction with (the thin metalforming the Specification of Letters Patent. Application filed October8, 1908. Serial No. 456,687.

' PateiitedJ uly23,1912.

body. portion of the shell a separate ring which is preferably of metal,although other material may be used if desired. This ring serves topermit the forming of threads of suitable size to be practical, and alsoserves to reinforce the lar er end of the shell so that it may be rcaily engaged by the eooperating threaded member.

A further advantage secured by this construction is that the receivershell is conr paratively light. In the event (if-forming the shell ofmaterial thick enough to be properly threaded, the shell would be soheavy as to, practi -ally prohibit its use.

A. further advantage secured by my improved construct-ion is to be foundin the case in which the main portion of both the shell proper and thecap are formed for the sake of cheapncss of thi'n sheet steel. Theconstruction used whichis above described and forms the subject matterof this invention permits the use of threaded rings of other material inconnection with the 4 formed steel members, as a result of wlneh thepossibility of corrosion of the threads engaging each other may beeliminated. If a steel shell had formed directly thereon the threads forengaging the cap, serious ditlh culty would result from the corrosion ofthe steel threads and in many cases would make it practically impossibleto remove the cap from the receiver after the same had been in use forsome time. This result \\'()ll( occur particularly in the ease in whichbot 1 the receiver and the cap were made of steel, each having thethreads 'arried thereby formed directly in the steel itself.

In connection with the use of sheet steel for forming thev main portionof the shell proper and the cap I employ a protecting varnish orcoating, as for example enamel or japan, to thoroughly protect" thesteel from the contact of moisture. This means could not be usedsatisfactorily. to protect since evidently the screw threads in order toproperly perform their function must be clean and free from any foreignmatter. In addition to the insulation thus secured by employ separateinsulating means between the shell and the cooperating mechanism of thereceiver contained therein. This, howvention and is not claimed herein.

the steel screw th1 'ads above referred to,

the enamel coating within the shell, I may ever, does not form a part ofthe present inno The several drawings illustrating my invention are asfollows:

Figure 1 is a longitudinal sectional view takenthrough the receivershell proper and the receiver cap and shows the cooperating mechanismcontained within the shell. Fig. 2 shows, partly in side view and partlyin section, the threaded ring used in connection with the thin metalreceiver cap to secure the same to the body portion of the receiver..Fig. 3 'is a view partly in section and partly in side view showing thethin metal receiver cap; and Fig. 4: is a cross section of theinsulating disk. Fig.5 is a simi- 1 lar view oft-he threaded ringused'in connection with the body portion of the shell to engage thethreaded part of the receiver cap. Similar numerals refer to similarparts throughout the several views.

As shown in the several drawings, the receiver shell 1 is of tubularconformation having'a slight taper, as indicated, and is enlarged at itsleft-hand end to cooperate 5 with the threaded ringzused to engage thereceiver cap. The threaded ring 1, as shown in Fig. 5, has formed on itsright-hand end, as shown in the drawings, an inwardly extended'fiange Padapted to engage the shoulder formed near the left-hand end of theshell 1 and thus prevents the ring 4;, from slipping over the memberl-to the left, as shown in the drawings. This ring 4 is of such aninternal diameter as to practically fit the cylindrical portion of theshell 1 formed upon its left-hand end. The ring 4 has formed-in itsouter surface screw threads 4 for engaging the receiver cap. The smallerend of the shell 1 has an en- 40 larged annular portion 17 formedthereon which is adapted to engage the receiver hook when the receiveris not in use. The material of the shell is continued around the smallerend and has an opening 15 formed in the end, through which the conductorcord 16 is adapted to pass. The edges of the opening 15 are formedinward, as indicated, so that the sharp edge ofthe ope'ning cannot comein contact with the corn ductor cord.

The cooperating mechanism of the receiver is of the well known type inwhich such mechanism is oompletely assembled independently of thereceiver casing. As

shown in the drawings, it consists essentially of permanent magnets 9, 9having secured to their left-hand ends a metal cup 10 within which thereceiver coils 11, 11 are located. The outer edge of the cup 10 isthreaded and adapted to cooperate with a threaded ring-I l, thediaphragm 1?, of the receiver being clamped between the threaded ring itand the cup 10 in operative relation to the p les 12 extending throughthe coils.

The cooperating mechanism just described is insulated from the shell 1by means of tubes 2 and 3 of insulating material, such as vulcanizedfiber or the like, which effectually prevent contact between the metalof the shell and any part of the cooperating mechb anlsm.

The cap used to close-the larger end of the shell 1 and to secure inposition therein the cooperating mechanism consists of a main ortion 6of thin sheet metal formed as indicated and adapted to cooperate with aseparate ring 5 so formed as to surround the portion 6 and extend intoengagement with the threaded portion-of the body of the receiver shellto clamp the cap 6 against its 0 left-hand end. 'An insulating disk 7 offiber .or similar material is used to prevent contact between thecooperating mechanism of the receiver and the receiver cap.

\Vhile I have shown my invention in the 5' particular embodiment hereindescribed, I do not, however, limit myself to this construction, butdesire to claim broadly any equivalent modification that will suggestitself to those skilled in the art. 00

lVhat I claim is:'

1. A telephone receiver shell consisting" of a body portion, a threadedring loosely engaging said body portion, a cap portion, and a threadedring loosely engaging said cap, said threaded rings adapted tointerengage to fasten said ca and body together.

2. A telephone receiver shell consisting of a body portion, a threadedring thereon,

a cap-portion and a threaded ring loosely '100 mounted thereon, saidthreaded rings adapted to interengage to fasten said cap to said bodyportion.

3. A telephone receiver shell consistin of a body portion having ashoulder thereon, a threaded ring adapted tofit over the body portionand having'a flange adapted to engagfi the shoulder, a cap portionhaving a threaded ring loosely mounted thereon, said threaded ringsadapted to interengage to fasten said cap and body portion together. i

4. In a telephone receiver shell, the combination of a body portion, athreaded ring on said body portion, a cap portion having a flangethereon, a threaded ring mounted on said body portion, and having aflange adapted to engage the flange on the cap,- said threaded ringsadapted to unite the cap and bodyportion. a

5. In a telephone receiver shell, the combination of a body portionhaving a shoulder thereon, a threaded ring loosely mounted thereon andhaving a flange engaging the shoulder, a cap portion having a threadedring mounted thereon, said rings adapted to intermeshto'connect saidbody and cap, and to hold said first named threaded ring against saidbody portion preventing their separation.

6. In a telephone receiver shell, the com-- tion and threads on said capadapted to en-- gage said threaded ring to unite said cap and bodyportion. v

7. In a telephone receiver shell, the com bination of a body portion,threads on said portion, a cap portion having a flange thereofi', athreaded ring having an annular flange thereon adapted to be mounted onsaid cap so the flanges interengage, said ring adapt ed to engage thethreads on the body portion to unitethe cap thereto.

8. In a telephone receiver'shell, the combination of a body portion,threads on said portion, a gap portion, a threaded ring loosely mountedon said cap portion and adapted to engage the threads on the bodyportion to firmly secure said parts together.

9. In a telephone receiver shell, the combination of a bodyportionhaving a thread- 'ed ring loosely mounted thereon, a cap portionhaving a threaded part associated therewith and adapted to engage thethreaded ring tounite said arts, said threaded ring held upon the b0 yportion by virtue of }the engagement of the cap part there- Wit 10. In atelephone receiver shell, the combination of a body portion, threads onsaid portion, a cap portion having a threaded ring loosely mountedthereon, said threads ed parts adapted to inter-engage to unite saidportions, said threaded ring retained in position on said cap by virtueof said interengagement.

In wltness whereof, I hereunto subscribe my nan1e this 5th day ofOctober A. D. 1908.

JOHN HALLDOW'.

Witnesses:

WM. W. DEAN, A. D. T. LIBBY.

